Lecture 02 - The spinal cord

Question 1

How many spinal nerves are in the spinal cord?

Answer 1

31

Question 2

what anatomical position is sensory and motor neurons

Answer 2

Sensory = dorsal/afferent (bring; carry towards)
Motor = ventral

Question 3

Is sensory discriminative or non-discriminative?

Answer 3

1. discriminative

Question 4

What are the 3 layers of the meninges?

Answer 4

DAP
Outer = Dura
Middle = Arachnoid
Inner = Pia

Question 5

Where is the Conus Medullaris located?

Answer 5

End/tip of the spinal cord

Question 6

What are the spaghetti fibres/horses tail called?

Answer 6

Cauda equina

Question 7

Where are needles typically injected in the spinal cord to collect cerebrospinal fluid without injecting a spinal nerve?

Answer 7

Around the cauda equina

Question 8

What anchors the spinal cord?

Answer 8

Filum terminale internum (internal) touches the pia

Filum terminale externum (external)

Question 9

how many cervical nerves are there?

Answer 9

8, with an enlargement between 5-7

Question 10

how many thoracic nerves are there?

Answer 10

12

Question 11

How many lumbar nerves are there?

Answer 11

5

Question 12

how many sacral nerves are there?

Answer 12

5

Question 13

how many coccygeal nerves are there?

Answer 13

1

Question 14

What is a dermatome?

Answer 14

map of the body at the spinal segmental level

derma meaning skin

Question 15

What is the receptor in the peripheral for touch?

Answer 15

Meisners corpuscle

Question 16

What is the receptor in the peripheral for pressure?

Answer 16

pacinian corpuscle

Question 17

How fast does myelinated sensory fibres conduct impulses?

Answer 17

50m/s

Question 18

What are free nerve endings?

Answer 18

not encapsulated
detect pain and temp
conduct impulses at 1m/s

Question 19

what is the DRG

Answer 19

where the cell body of neurons reside

Question 20

What are the effects of injuries to the spinal cord?

Answer 20

Sensory loss/spastic paralysis/flaccid paralysis

quadriplegia/paraplegia